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The thought struck me instantly that the cause of all our misfortunes lay in the drifting of some large piece of the wreck over the top of the bell, which had got entangled with the air-tubes and chain, and defied all the efforts of the workmen to raise us.
For several minutes this torture endured, each second of which appeared to be an hour to those imperilled beings, who surely must have perished, as they lay pinned fast to the floor of the aerostat by that pitiless weight, only for the precious air-tubes in connection with that cylinder of compressed air.
And again, speaking of the cells that line the air-tubes, he says: "The whole interior, then, of the air-tubes resembles nothing so much as a field of corn swayed by the wind to and fro, the principal sweep, however, being always upwards towards the throat.
The peculiar sound is heard in two different conditions the one in which a child having caught cold, instead of the air-tubes alone being affected, the windpipe, and especially its upper part, becomes congested, and the lining membrane swollen.
During this aquatic residence, the little creature finds it necessary to breathe; and that he may do so comfortably, notwithstanding his habits of seclusion, and his constant immersion in fluid, he pushes out from his shoulders and back a series of delicate little leaf-like plates. A branch of one of the air-tubes of his body enters into each of these plates, and spreads out into its substance.
In the body of the bird there are several large bags, like the lungs, called air-chambers; many of their bones are hollow, and others are pierced with long winding tubes called air-tubes. All these air-chambers and air-tubes are connected with the lungs so that air can pass into and out of them at each breath.
From these larger vessels arise a great number of smaller ones which branch and subdivide again and again until all the tissues are supplied by these minute little air-tubes that carry the oxygen to all parts of the body and carry off the waste carbon dioxid. These air-tubes are emptied and filled by the contractions of the walls of the abdomen.
E E, entries lighted over outer doors, one for the boys and the other for the girls. T, teacher's platform and desk. R L, room for recitation, library, and apparatus, which may be entered by a single door, as represented in the plan, or by two, as in the following plan. S S, stoves with air-tubes beneath.
Q, entrance for girls to the same. D D, doors. W W, windows. T, teacher's platform and desk. G H, desk and seat for two scholars, a section of which is represented at X, in the Primary Department. I I, recitation seats. B B, black-boards. S S, stoves, with air-tubes beneath. c v, chimney and ventilator. R, room for recitation library, apparatus, and other purposes.
Some of them drive the air into each room by means of a powerful steam, or electric, fan in the basement; others suck the used-up air out of the upper part of each room, thus creating an area of low pressure, to fill which the fresh air rushes in through air-tubes or around doors and windows. They have elaborate methods of warming, filtering, and washing the air they distribute.
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